Taper boring head



Aug' 8, 1950 c. TREE TAPER BORING HEAD Filed May 26, 1947 2 Sheets-v-Sheet 1 ffy-9.2.

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mlllllllll "fil Si! INVENTOR CHARLES TREE Aug. 8, 1950 C, TREE 2,517,738

TAPER BORING HEAD Filed May 26. 1947 2 Sheets-Sheet 2 mill!"Iv ATTORNEYS Patented Aug. 8, 1950 UNITED.. STATES PATENT" CFFICE t 2,517,738 TAPER BORING HEAD Charles Tree, Racine, Application May 26, 1947,` Serial No. "750,43f1`` (o1. 'rv-sse) 4 Claims.

This invention appertains to machine tools and more particularly to a novel taper boring head.

One of the primary objects of my invention is to provide a versatile boring head in which the boring bar and its cutting tool can be readily and accurately adjusted to any desired angle at One side of the longitudinal axis of the shank of the boring head, whereby to facilitate the accomplishment of various cutting operations such as the accurate cutting on a taper.

Another salient object of my invention is to provide novel means for mounting a tool or boring bar slide on a swivel base carried by the body of the boring head, whereby a desired angle of the boring bar on the body can be readily obtained. i

A further object of my invention is to provide novel means for accurately advancing the tool or boring bar slide on the swivel base irrespective of the adjustment of said base during the rotation of the head, whereby `the boring bar and its cutting tool can be moved lateral-ly of the head to bring about the cutting of the desired taper or other operation.

A still further object of my invention is to provide a novel simple and compact boring head and mechanism for accurately adjusting the boring bar and its cutting tool longitudinally or laterally of the shank of the head.

With these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described, claimed, and illustrated in the accompanying drawings, in which drawings:

Figure 1 is a front elevational view of my improved boring headshowing one adjustment of the boring bar and the swivel base in dotted lines, parts of the gure being shown broken away and in section to illustrate structural detail.

Figure 2 is a longitudinal sectional view through the boring head taken on the line 2-2 of Figure 1 looking in the direction of the arrows.

Figure 3 is a detail transverse sectional view taken on the line 3-3 of Figure 1 lookingin the direction of the arrows.` l

Figure 4 is a side elevational view of the complete boring head, a part of the view being shown in section and such section being taken on the line 4-4 of Figure 5 looking in the direction of similar reference `characters designate corresponding parts throughout vthe several views the letter H generally indicates my improvedboring head for supporting a boring bar B.

The boring head H includes a body 'I0 having a substantially inner cylindrical portion Illand an outer forwardly extending lateral portion I2;

The axial center of the innerv cylindrical portion II `canbe providedwith a hub or the" like I31`to which fcan `be secured in any preferred manner the shank I4 for attachment with the machine with? which the tool is used (notshown). ,l

The inner face of the lateral forwardly extend ing portionl I2` of the head is provided with an annular groove or` guideway I5 which is of a` sub# stantial T shape in cross section. Attention is called to the fact that the portion I2 extends at one side of the longitudinal axis of the shanklll.`

the heads22 of which can be of a T shap'e for'slidi ing movement within the annular guide groove I5. Byloosening the bolts 2I the 'swivelbase can be turned on the portion I2 of the head, so that theslide I8 can be positioned at different angles relative'to the'longitudinal axis of the shank. To facilitate theaccuratesetting of the swivel base I6 the samecan be provided with appropriate graduations 23. An indicating arrow 24 on the portion I2 of thehead cooperates with the scale or graduations 23 for the setting of said base. i

The slide I8 has formedthereon the outwardly projecting tapered boss 25 for carrying theboring ba'rB.

The boring bar Bis ofaspecial characterfin that its inner end has formed thereon an interl nally tapered sleeve 26 for receiving the boss."v A set screw 2l is threaded axially into the boss and bears against a washer 28.`l The washer in turn bears against the sleeve 26 and rmly` holds "the boring bar in position on the slide. In all other respects the boring bar B is conventional and is provided at its forward end with socketsZS `for selectively receiving the cutting tool 3U.

Great stress is laid on the means for adjusting the slide I6 and this means isso construttdand arranged that the slide can be moved diametrically across the swivel base irrespective of the adjustment of the base on the boring head. The means for adjusting the slide includes a ring spur gear 3| which is keyed or otherwise fastened to the hub I3 of the head and this hub has rctatably mounted thereon a ring spur gear 32.

Also rotatably mounted on the hub I3 is the fine adjusting and feed collar 33. The collar can be held in position by a flange 34 carried by the shank I4. The outer face of the adjusting and feed collar 33 can be knurled or roughened to facilitate the grasping thereof.

Rotatably mounted on bearing studs 35 carried by the collar are pinions 36 which mesh with the spur gears 3| and 32. l

Extending longitudinally of the portion |2 of the body I is a shaft 31 having formed on or secured to its inner end a pinion 38. The pinion 38 meshes with the spur gear 32. Keyed or otherwise secured to the inner end of the shaft 31 is a worm 39. The pinion shaft 31 can be rotatably mounted in a suitable bushing 48 carried by the body. Meshing With the worm 39 is a Worm wheel 4I. The worm wheel 4I is rotatably mounted on a pinion shaft 42 and the inner end of the shaft 42 has formed thereon or secured thereto a pinion 43 which meshes with a rack bar 44. The rack bar 44 extends longitudinally ofthe slide I8 and is secured to the slide by machine screws 45. Keyed to the pinion shaft 42 is a bushing 46 which is rotatably mounted in the swivel head |6 at the axial center thereof. Bearing against the outer side of the worm wheel 4I is a friction washer 41 and threaded against said washer is .a cap nut 48 carried by the pinion shaft. Hence by tightening the vnut 46 on the pinion shaft 42 the worm wheel 4| can be held tight on said shaft against the bushing 46 for rotation with the shaft. By loosening the cap nut 48 with a polygonal wrench this same wrench can be inserted further into a polygonal opening 49 in the pinion shaft 42 so that the pinion shaft can be turned independently of the worm wheel 4| and the worm 39.

It is to be noted that the outer surface of the adjusting 'and feed collar 33 can be provided with graduations 58 and an indicating arrow or the like can be carried by the portion |I of the boring head'body I0. Hence the amount of rotation of the adjusting collar can be readily seen.

As an example of the gear ratio for actuating the slide, the pinions 36 can be provided with sixteen teeth and the spur gear 3| with forty-three teeth and the Spur gear 32 with forty-four teeth. The pinion 38 driven from the spur gear 32 can also be provided with sixteen teeth. The rack pinion 43 can be provided with twelve teeth.

Now it is to be noted that the spur gears 3| and 32 have substantially the same number of teeth and that the spur gear 32 only has a single additional tooth more than the gear 3|. This brings about the desired ne adjustment of the slide I8.

When the boring head is at rest, the collar 33 can be turned and the pinions 36 rotating about the spur gears 3| and 32 will turn the spur gear 32 a certain small given distance. This in turn will move the pinion shaft 31 and the turn of the pinion shaft 31 will be transmitted to the slide I 8 through worm 39, worm wheel 4|, pinion shaft 42, pinion 43, and rack 44.

During rotation ofthe hea-d sby the-machine not shown), the adjustment .and feed coll-ar 3.3

can be held stationary by the hand of the operator and consequently the rotation of the spur gears 3| and 32 around the pinions 36 will bring about a steady slow rotation of the gear 32. This in turn will bring about the desired steady slow feed of the slide I6.

Obviously, if the swivel head I6 has been adjusted so that the slide I8 is at an angle to the longitudinal axis of the shank I4, then said slide will be fed forwardly laterally'.

Various changes in details can be made without departing from the spirit or the scope of my invention but what I claim as new is:

l. A machine tool head comprising a body including a substantially cylindrical portion and a forwardly extending lateral portion, an attaching shank carried by the axial center of said cylindrical portion, a swivel base plate having its inner face iitted against the inner face of the forwardly lateral projecting portion for turning movement, means securing said base plate ina selected adjusted position, a diametrically extending guideway on the outer face of said base plate, a slide in said guideway, a tool carrier connected with said slide, a rack bar on the slide, a pinion shaft rotatably carried by the forwardlyprojecting portion of the body extending into the axial center of the base plate, a pinion on said shaft meshing with the rack bar, a worin `wheel secured to the shaft, a fine adjusting and feedV collar rotatably mounted on the cylindrical porti-on of the body, a ring'spur gear secured to the body inside the collar, a second ring spur gear'rotatably mounted on the body inside of said collar, pinions carried by the collar meshing w'ithsaid ring spur gears, a worm shaft rotatably carried by the `forwardly projecting Vportionofr said body, a pinion on said worm shaft meshing Awith the ring spur gear rotatably mounted-on said `body and a worm secured tothe worm shaft meshing with the worm wheel.

2. A machine tool head comprising a body including a substantially cylindrical portion and a forwardly extending lateral portion, an attaching shank carriedby the axial center of said cylindrical portion, a swivel base plate having its inner face :dtted against the'finner face of the forwardly lateral projecting portion 'for turning movement, means securing said base plate ina selected adjusted position, a diametrically extending guideway on the outer face of said base plate, a slide in said guideway, a tool carrier connected with said slide, a rack bar on the slide, a pinion shaft rotatably carried by the forwardly projecting portion of the body extending into the axial center of the baseplate, a pinion on said shaft rnesliring with the rack bar, a worin wheel secured to the shaft, a fine adjusting and feed collar rotatably mounted on the cylindrical portion of the bod?, a ring spur gear secured to the body inside the collar, a second ring gear rotatably mounted on the body inside of said collar, pinions carried by the collar meshing with said ring spur gears, a worm shaft rotatably carried by the' forwardly projecting Iportion of said body, a pinion on said worm shaft meshing with the spur gear rotatably mounted on said body. a worm secured to the worm shaft meshing with the worm wheel, and means for turning the rack bar pinion shaft independently of the worin worm gear.

3. A machine tool head comprising a bodyv including a substantially cylindrical portion and a forwardly extending lateral portion, an attaching shank carried by the axial center of said cylindrical portion, a .swivel base .plate having its ,inner face fitted against the inner face of the forwardly lateral projecting portion for turning movement, means securing said base plate in a selected adjusted position, a dimetrically extending guideway on said base plate, a slide in said guideway, a tool carrier connected with said slide, a rack bar on the slide, a pinion shaft rotatably carried by the forwardly projecting portion of the body extending into the axial center of the base plate, a pinion on said shaft meshing with the rack bar, a worm wheel secured to the shaft, a fine adjusting and feed collar rotatably mounted on the cylindrical portion of the body, a ring spur gear secured to the body inside the collar, a second ring spur gear rotatably mounted on the body inside of said collar, pinions carried by the collar meshing with said ring spur gears, said ring spur gear rotatably mounted on the body having a greater number of teeth than the ring spur gear secured to the body, a worm shaft rotatably carried by the forwardly projecting portion of said body, a pinion on said Worm shaft meshing with the ring spur gear rotatably mounted on said body and a worm secured to the worm shaft meshing with the worm wheel.

4. A machine tool head comprising a body including a substantially cylindrical portion and a forwardly extending lateral portion disposed on one side of the axial center of said cylindrical portion, a swivel base plate having its inner face fitted against the inner face of the forwardly extending laterally projecting portion for turning movement, means securing said base plate in a, selected adjusted position, a dametrically exshaft, a ne adjusting and feed collar rotatably mounted on the cylindrical portion of the body, a ring spur gear secured to the body inside of the collar, a second ring spur gear rotatably mounted on the body inside of said collar, idle pinions carried by the collar meshing with both of said ring spur gears, a worm shaft rotatably carried by the forwardly projecting portion of said body, a pinion secured to said worm shaft meshing with the ring spur gear rotatably mounted on said body, a worm secured to the worm shaft meshing with the worm wheel on the pinion shaft, and manually operable means for clamping the worm Wheel on said pinion shaft.

CHARLES TREE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,834,716 Kis Dec, 1, 1931 2,288,004 Lauderdale June 30, 1942 2,457,040 Hall Dec. 21, 1948 

